package chappter04.Example14;
class Animal17{
    public void shout(){
        System.out.println("动物叫......");
    }
}
class Dog17 extends Animal17{
    public void shout(){
        System.out.println("汪汪......");
    }
    public void eat(){
        System.out.println("吃骨头......");
    }
}
public class Example17 {
    public static void main(String[] args) {
        Animal17 a1 = new Dog17();
        System.out.println("Animal a1 = new Dog() : " + (a1 instanceof Animal17));
        System.out.println("Animal a1 = new Dog() : " + (a1 instanceof Dog17));
        Animal17 a2 = new Animal17();
        System.out.println("Animal a2 = new Animal() : " + (a2 instanceof Animal17));
        System.out.println("Animal a2 = new Animal() : " + (a2 instanceof Dog17));

    }
}
